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Frost dates for Kennewick, Washington

In a typical year, Kennewick’s last spring frost lands around Mar 28 and the first fall frost around Oct 30, a growing season of about 216 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 7b.

Right now the growing season is open, with about 5 days until the typical first fall frost.

Last spring frost and first fall frost odds for Kennewick, Washington
OddsLast spring frostFirst fall frost
10 percentMar 9Oct 18
50 percentMar 28Oct 30
90 percentApr 10Nov 15

A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.

Soil in Kennewick is typically around 53°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.

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Common questions

When is the last frost in Kennewick, Washington?

Kennewick’s last spring frost falls around March 28 in a typical year. One year in ten it is done by March 9, and one year in ten frost holds on until April 10. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Kennewick?

The first fall frost arrives around October 30 in a typical year, as early as October 18 in an early year and as late as November 15 in a late one.

How long is the growing season in Kennewick?

About 216 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Kennewick in?

Kennewick is in USDA hardiness zone 7b under the 2023 USDA Plant Hardiness Zone Map.

Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.

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